滑动构造下"三软"不稳定突出煤层可伸缩无级变径钻头和三棱钻杆的研制应用
활동구조하"삼연"불은정돌출매층가신축무급변경찬두화삼릉찬간적연제응용
Development and Application of Scalable Stepless Variable Diameter Drilling and Three-arris Drilling Pipe of Three-soft Unstable Coal Seam Under Slipping Structures
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